What is the noun of sack?

The noun of "sack" is actually just sack itself. It can be used as both a noun and a verb.

Here are some examples of "sack" as a noun:

* He carried his groceries in a sack.

* The pirate buried his treasure in a burlap sack.

* The coach gave the player the sack. (This is an idiom meaning the player was fired)

Let me know if you have any other words you'd like to explore!